POROUS₂(ANATASE) ELECTRODE FOR HIGH-RATE LITHIUM INSERTION

Extremely High Silver Ionic Conductivity in Composites of Silver Halide (AgBr, AgI) and Mesoporous Alumina

“…studies have been already reported using mesoporous oxides as the dispersant in weak electrolytes. In work by Yamada et al, [10] the ionic conductivity of the LiI:SiO 2 system was shown to be dependent on the pore structure of silica materials. In LiI:Al 2 O 3 , [11] a conductivity enhancement of three orders of magnitude (for 4 nm pore size) was reported.…”

“…[9] These advantages have also been put to use in the field of solid-state ionics, viz., for production of composites with well-controlled mesostructure. [10][11][12] In our context, the benefits of using mesoporous materials is obvious: by loading the electrolyte matrix into a network of interconnected mesopores, as schematically shown in Figure 1b, the surface area of interfaces can be extended to values as high as 300-1000 m 2 g -1 , compared with 10-150 m 2 g -1 for fine insulator particles, [13] and a much higher volume fraction (compared to solid nanometer-sized particles) can be realized without losing percolation; both of these points lead to much higher ionic conductivities. As the size of ionic-conductor material loaded inside the pores is comparable to the Debye length (a few nanometers), consideration of mesoscopic effects on ionic conductivity due to overlapping space-charge regions becomes increasingly important.…”

Silicon Inverse‐Opal‐Based Macroporous Materials as Negative Electrodes for Lithium Ion Batteries

“…Since then several more electroactive materials have been synthesized in the inverse-opal form and explored as both positive [24][25][26] and negative electrodes. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In most cases the use of inverse opals led to an improvement in rate capabilities and often to better cycling behavior of the materials. Composite materials based on inverse-opal structures have been also suggested to be used as lithium ion battery electrodes.…”

High Lithium Electroactivity of Nanometer‐Sized Rutile TiO2

“…As far as TiO 2 is concerned, it is the best rate performance ever measured especially at the higher rates. [10,24] This high rate capability results from the transport advantages of this special nanostructure, such as shorter transport lengths for both electronic and Li + transport as well as a higher electrode-electrolyte contact area. In summary, we have reported here that nanometer-sized rutile shows a much higher electroactivity towards Li insertion than micrometer-sized rutile.…”